Study on the Microstructure and Wear Mechanism of Grain-Refined Zinc-Aluminum Alloy

2012 ◽  
Vol 174-177 ◽  
pp. 711-715
Author(s):  
Shu Qing Yan ◽  
Hui Xian Wang
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Mechanism ◽  
Titanium Content ◽  
Wear Property ◽  
Test Results ◽  
Titanium Aluminum Alloys ◽  
Test Conditions ◽  
Titanium Aluminum

Some low-titanium aluminum alloys were prepared and the effect of titanium elements on microstructure and wear property of zinc-aluminum alloy was investigated. The test results showed that addition of titanium is an effective way to refine the grain size of zinc-aluminum alloy. As the titanium content is 0.04 wt%, the grain size becomes to be a minimum value. The wear resistance is also improved with the decrease in the grain size. This can be attributed to the grain boundary strengthening of the test alloys leading to strain hardening. SEM photomicrographs of the worn surfaces shows that the test alloys with and without grain refinement exhibit similar wear mechanism. However, the grain-refined sample of the alloy exhibited a more stable friction coefficient than that of the untreated ones under the same test conditions.

Microstructure and Tensile Property of Zn-Al Alloy Reinforced with Titanium Produced by Electrolysis

2009 ◽  
Vol 79-82 ◽  
pp. 1415-1418 ◽  
Author(s):  
Shu Qing Yan ◽  
Jing Pei Xie ◽  
Wen Yan Wang ◽  
Ji Wen Li
Keyword(s):  
Grain Size ◽  
Tensile Property ◽  
Heterogeneous Nucleation ◽  
Titanium Content ◽  
Small Dimension ◽  
Al Alloy ◽  
Exotic Particles ◽  
Titanium Aluminum ◽  
High Dispersity

In this study, some low-titanium aluminum alloys produced by electrolysis were prepared and the effect of various titanium contents on microstructure and tensile property of Zn-Al alloy was investigated. The test results showed that addition of titanium by electrolysis is an effective way to refine the grain size of Zn-Al alloy. As the titanium content is 0.04 wt%, the grain size becomes to be a minimum value and the tensile property of the alloy reaches to the maximum. Electrolysis showed that titanium atoms are to be some inherent particles in low-titanium aluminum alloy. These titanium atoms enter into the aluminum melt liquid and spread to the whole melt rapidly under stirring action of electromagnetic field of the electric current. The heterogeneous phase nuclei are high melting TiC and TiAl3 particles formed from in-situ precipitating trace C and Ti during cooling process. These in-situ precipitating heterogeneous nucleation sites with small dimension, high dispersity, cleaning interface and fine soakage with melt, have better capacity of heterogeneous nucleation than of exotic particles. It may inhibit grain growth faster and more effective in pinning dislocations, grain boundaries or sub-boundaries.

Composite Fretting Wear of Aluminum Alloy

2007 ◽  
Vol 353-358 ◽  
pp. 868-873 ◽  
Author(s):  
Min Hao Zhu ◽  
Zhong Rong Zhou
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Relative Motion ◽  
Wear Mechanism ◽  
Normal Force ◽  
Fretting Wear ◽  
Test Results ◽  
Contact Configuration ◽  
Inclined Angle ◽  
Flat Contact

A complex relative motion of fretting combined by dual motions of radial and tangential fretting was achieved on a modified fretting tester. The composite fretting motion was induced by the action of an oscillating normal force in a sphere-on-inclined flat contact (52100 steel ball against 2091 aluminum alloy). Two types of inclined angles (45° and 60°) were used in the tests. Variations of veridical force vs displacement have been recorded and analyzed as a function of cycles. Effects of the cyclic normal force and the inclined angle were discussed. The test results showed that wear, cracking and plastic deformation accumulation with a strong dissymmetry in damage morphology was observed. A transformation of fretting mode from composite to radial fretting mode occurred due to a strong modification at local contact configuration. As a conclusion, a physical model for wear mechanism of composite fretting was presented.

Diffusion in the Interface Region of Ti/TiAl-Nb Bonding

2006 ◽  
Vol 249 ◽  
pp. 193-200
Author(s):  
Lembit A. Kommel
Keyword(s):  
Titanium Alloy ◽  
Transition Zone ◽  
Chemical Elements ◽  
Titanium Content ◽  
Interface Region ◽  
Diffusion Region ◽  
Ti Alloy ◽  
Titanium Aluminum Alloys ◽  
Titanium Aluminum ◽  
Solid Titanium

Diffusion in the interface regions of lightweight heatproof quality titanium and titanium/aluminum alloys was investigated. We studied the diffusion of aluminum from intermetallide to titanium alloy. The concentration of other chemical elements and microhardness has been measured in diffusion region formed in the solid titanium alloy. The interface region includes a transition zone from the initially solid Ti-alloy and the molten TiAl-Nb intermetallic substrate. The width of the interface region after diffusion bonding is 45-60 µm. The titanium content decreases and aluminum content increases starting from surface up to 120-150 µm in depth in solid titanium alloy. As a result of diffusion, the intermetallic Ti3Al thin layer was formed in the transition zone in the Ti-alloy substrate. The microporosity was also formed in the interface region.

Investigation of mechanical and tribological properties of different grain size iron scale reinforced polymer composite

2020 ◽  
pp. 096739112098276
Author(s):  
Bilal Kursuncu ◽  
Azmi Erdogan ◽  
M Sabri Gok ◽  
Bilal Demirel
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Polymer Material ◽  
Wear Mechanism ◽  
Steel Production ◽  
Production Plant ◽  
Grain Sizes ◽  
Iron Scale

In this study, the change of mechanical properties by adding iron scales of different sizes into polypropylene (PP) was investigated. The iron scale was obtained from a steel production plant and adjusted to 30, 50, 90, 120, and 150 µm grain sizes. These iron scales were then added to the polymer material at a rate of 5% by weight. Wear and tensile strength tests were applied to the samples, which were formed in two different types. According to the results obtained, the wear and tensile strength of polymer material in all grain sizes were improved with an added iron scale. It was observed that the wear resistance of the composite material formed with the addition of fine-grained reinforcing element was the highest. Although grain size increased with increasing tensile strength, wear resistance did not increase. Besides, the friction coefficient was measured to be lower at increasing load. While the effective wear mechanism in pure polymer material is plastic deformation, this wear mechanism has not been found in composite materials with different grain sizes. In this study, it has been shown that iron scales have a positive effect on the mechanical properties of polymer composites.

scholarly journals Microstructure and Properties of AA6061/SiCp Composites Sintered under Ultra High-Pressure

2020 ◽  
Vol 10 (20) ◽  
pp. 7363
Author(s):  
Lei Xu ◽  
Erkuo Yang ◽  
Yasong Wang ◽  
Changyun Li ◽  
Zhiru Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Wear Property ◽  
Ultra High Pressure ◽  
High Pressure Sintering

Ultra high-pressure sintering (UHPS) was used to prepare AA6061/SiCp composites with different contents and the effect of sintering temperatures on microstructure and mechanical properties was investigated in this study. The results showed that a uniform distribution of nano-SiC particles (N-SiCp) is obtained by the UHPS method. With the increase in N-SiCp contents, the higher hardness and better wear resistance could be inspected. The interfacial reactions and Al4C3 phase appeared above 550 °C. The relative density of composites first increased and then decreased; with the temperature raising it reached 99.58% at 600 °C. The hardness and wear property showed the same trend with the hardness reaching 52 HRA and wear rate being 1.0 × 10−6 g/m at 600 °C. Besides, the wear mechanism of the composites is mainly composed of abrasive wear and adhesive wear.

MICROSTRUCTURE PERFORMANCE OF La2O3-MODIFIED TUNGSTEN INERT GAS CLAD COMPOSITE COATING

2019 ◽  
Vol 27 (07) ◽  
pp. 1950182
Author(s):  
MO-LIN SU ◽  
JIA-NING LI ◽  
FEI-HU SHAN ◽  
KE-GAO LIU ◽  
HUI-LIN XU
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Inert Gas ◽  
Hard Coating ◽  
Wear Property ◽  
Test Results ◽  
Alloy Substrate ◽  
Tc4 Alloy ◽  
Surface Performance

A hard coating free of obvious defects is produced on a Ti–6Al–4V (TC4) alloy substrate by means of tungsten inert gas clad (TIGC) of the Deloro22–WC–La2O3 mixed powders, which greatly increased the surface performance of the substrate. Test results indicated that large quantities of needle-shape precipitates were formed in the Deloro22–WC TIGC coating, increasing the microhardness significantly, and also lots of pores are produced in this coating, weakening the wear resistance. It was noted that a fine/compact microstructure is obtained in the Deloro22–WC–La2O3 TIGC coating, also the defects cannot be observed obviously. La2O3 addition can effectively improve the fluidity of melt and hinder the growth of grains in TIGC pool, favoring a fine/compact microstructure to be produced, and also improving the wear property of the TIGC coating.

scholarly journals The Influence of Selected Test Conditions on the Impact Strength of Adhesively Bonded Connections

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1320 ◽  
Author(s):  
Jan Godzimirski ◽  
Andrzej Komorek
Keyword(s):  
Aluminum Alloy ◽  
Impact Strength ◽  
Experimental Research ◽  
Test Results ◽  
Adhesively Bonded ◽  
Elastic Deformations ◽  
Epoxy Adhesives ◽  
Test Conditions ◽  
Adhesive Connections ◽  
The Impact

The conditions of adhesive connections testing can significantly affect the recorded findings. The standards, under which the investigations are conducted, do not take into account numerous factors that can greatly influence the outcome of the tests. Moreover, the research parameters in the standards are not specified. It is not defined in what manner their change, or any failure to comply with the standards, will affect test results. This article presents the results of experimental research, completed with numerical simulations, designed to test to what extent the recorded impact strength of adhesive connections is affected by the stiffness of the test stand, and the speed and energy of the impactor. In the experimental research, the authors used block samples whose substrates were made of an aluminum alloy. The elements of the samples were bonded by means of three different epoxy adhesives. The models used in numerical calculations were built on the basis of the real dimensions of the specimens used in this experimental research. As a result of the performed tests and conducted calculations, it was found that the use of test stands of lesser stiffness resulted in an increased registered impact strength due to an increased energy value of elastic deformations.

Effects of Incoherent Dispersoids. Temperature, and Deformation Mode on Dislocation-Substructure Development in Ti-8A1 and Ti-10Al Alloys

1982 ◽  
Vol 40 ◽  
pp. 476-477
Author(s):  
J. E. O’Neal ◽  
S. M. L. Sastry
Keyword(s):  
Grain Size ◽  
Aluminum Alloys ◽  
Dislocation Substructure ◽  
Lattice Structure ◽  
Deformation Mode ◽  
Significant Loss ◽  
Precipitation Strengthening ◽  
Al Alloy ◽  
Titanium Aluminum Alloys ◽  
Titanium Aluminum

In titanium-aluminum alloys with aluminum concentrations between 10 and 20 at.%, the ordered and coherent α2 phase (based on the composition Ti3Al and having an ordered DO19 lattice structure) precipitates upon aging. Although a significant loss of ductility generally accompanies the precipitation strengthening in these alloys, it is possible to improve the roomtemperature ductility of an α2-precipitation-strengthened Ti-Al alloy by reducing the grain size and incorporating incoherent dispersoids into the lattice.

Effect of WC Grain Size on the Abrasive Wear Resistance of HVOF Spraying WC-Co Coatings

2010 ◽  
Vol 97-101 ◽  
pp. 1344-1347
Author(s):  
Ming Li ◽  
Yue Yang ◽  
Hui Chen
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Failure Mechanism ◽  
Wear Mechanism ◽  
Abrasive Wear Resistance ◽  
Nanostructured Coating ◽  
Hvof Spraying ◽  
Surface Plasticity ◽  
Size Powder

Three different WC grain size powder were used to prepare WC-Co coatings employing HVOF technique. The effect of WC grain size on the abrasive wear resistance and failure mechanism were analyzed. The results show that the abrasive wear resistance increases with the decrease of WC grain size. Nanostructured coating is high in surface plasticity. It can only be pressed out of prints, the opportunity of cutting is small. Micro-cutting wear dominates the main abrasive wear mechanism of nanostructured coating.

Effects of the Pin-on-Disc Parameters on the Wear of Alumina

2010 ◽  
Vol 65 ◽  
pp. 39-44 ◽  
Author(s):  
Nadetsa R. Tedesco ◽  
Eliria M.J.A. Pallone ◽  
R. Tomasi
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Wear Test ◽  
Preliminary Test ◽  
Critical Parameters ◽  
High Wear Resistance ◽  
Test Results ◽  
Pin On Disc ◽  
The Many ◽  
Testing Condition

There is a growing interest in the application of ceramic as high wear resistance materials due to the unique properties. Although brittleness and low toughness, recent improvements in alumina processing have lessen this restrictions and suggest improvements in wear resistance which in turn have driven some research on this. Since a direct comparison between the many published works regarding this wear improvement is complicated due to the fact that wear resistance is a response of the microstructure, material and testing condition, the work herein presented aims to first do a literature review on the main parameters to be controlled in a pin-on-disc apparatus on the wear of alumina and then discuss preliminary test results and analyze the influence of critical parameters as load and sliding speed in a pin-on-disc wear test in a dense and sub micrometer grain size alumina.

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